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OIRSA Signature Programs
 
OIRSA Signature Programs
 
Overview

This site contains a searchable catalog of objects found in the area around M31, studied with the Hectospec fiber spectrograph on the MMT. Types of objects include star clusters of various ages, individual stars in the foreground and actual members of M31, PNe, symbiotic stars, HII regions, and background galaxies. These objects were the subject of several Hectospec data papers published starting in 2009. Observed parameters in the catalog are detailed below, and were collected from those papers and several others. Some values available here are unpublished, such as the accurate HST coordinates, the [Fe/H] derived from strong lines, and many of the stellar velocities.

Also provided for most but not all targets is a link to a tar file that contains the optical MMT spectrum, HST images, and other high level products. The spectra themselves are in fits format. The data have been linearized in wavelength, with the first band being the spectrum, the second being a different extraction, the third the sky that was subtracted, and the fourth is the error in the flux. The data have been flux calibrated using standard stars. In general the fluxng is stable though there are some issues. First, the wavelength dependent throughput has not been fully corrected as a function of fiber. This can be seen by comparing spectra of the same target taken on different nights, and through a different fiber. Second, there is a red LED in the fiber positioner that contaminates nearby fibers. An attempt has been made to automatically remove this, but occasionally the correction is too strong, resulting in a spectrum that declines in the red, beyond 8000A.

The spectral files are given a name that refers to the target and the date observed. Thus some targets have several spectra because they were repeatedly observed. We have not combined these, nor have we deredshifted the data according to the derived velocity. The wavelength solution, in keeping with SDSS methods, has been corrected for the Heliocentric motion.

Gallery: Star Clusters in M31

Search Data
  • Select Search Constraints and Output, then click the Search button.
  • Leave a field empty to search over the full range.
  • Hover over a keyword to see example usages.
  

Search Constraints


Object Name (SIMBAD)  or  Coordinates (J2000)
SIMBAD-resolvable object name, or search position in RA and Dec (decimal degrees or sexagesimal formats [hh mm ss  dd mm ss]) in J2000
Examples
M31
148.888 69.065
9 55 33.2  69 03 55

Search Radius (arcmin)
Search radius (arcmin) around given point coordinates
Examples
1.0
or

Input File Upload
Upload a list of target positions. This expects a text file with three floats per line: RA (deg), Dec (deg), & search radius (arcsec).
Examples
148.888   69.065   60   (line 1)
10.68471   41.268750   90   (line 2)
   Clear the Input File

Catalog Object Name
String match to Catalog Object name. This matches to the names in the catalog only, and does not preform a SIMBAD lookup or perform a coordinate-based search.

Object Type
String match to Object Type field. Options are:
old_cluster
disk_cluster
cluster (type unknown)
star
probstar
PN
HII
syst (Symbiotic Star)
back
na
unknown
 

Velocity (km/s)
Velocity (km/s) from Hectospec data. Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

Age (Gyr)
Age (Gyr) from C09 (Caldwell 2009, AJ 137, 94), C11 (Caldwell 2011 AJ, 141, 61), C16 (Caldwell ApJ 824, 42), or S11 (Strader 2011, ApJ 142, 8). Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

Z
[Fe/H] estimate using Fe lines from C11(Caldwell 2011 AJ, 141, 61). Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

Log(M)
log of mass, using V and M/L=2. Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

g (mag)
photometry from P2010 (Peacock et al MNRAS 402, 803). Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

V (mag)
total magnitude from C09 (Caldwell 2009, AJ 137, 94). Operators <, >, +/- and .. (between) can be used to select a range.
Examples
0.2 or =0.2 -- select only values exactly 0.2
!=0.2 -- select only values different from 0.2
<0.15 -- select values samller than 0.15
>=0.2 -- select values greater or equal to 0.2
0.2 +/- 0.05 -- select values between 0.15 and 0.25 inclusive
0.13 .. 0.18 -- select values between 0.13 and 0.18 inclusive

Columns
Columes to be displayed.
Examples
default: select columns
full: all columns

Output


Summary Table (format)
Select one of the file formats in the list.
Examples
"HTML"
"Text (with Tabs)"
Output Table
Sort the result in ascending or descending order by the chosen keyword up to the number of objects you specified.
Examples
Sort by "Velocity" "descending"
Limit to "100" items
 
Output Table
Sort the result in ascending or descending order by the chosen keyword up to the number of objects you specified.
Examples
Sort by "Velocity" "descending"
Limit to "100" items
items
Data Description
Parameter Description Column Set
Catalog Object Main catalog name: Revised Bologna Catalog (RBC) name, or from J2015 if none default
Object_J15 Object name from J2015 (ApJ 2015, 802, 127) full
Specname Spectrum object name full
RA Right Ascension J2000. Objects with HST flag set have coords precise to 0.1" default
Dec Declination J2000. Objects with HST flag set have coords precise to 0.1" default
X Distance in kpc along the major axis, SW is positive. M31 distance assumed to be 770kpc, position angle 52.3 degrees. full
Y Distance in kpc along the minor axis, NW is positive full
Velocity Velocity (km/s) from Hectospec or Hectochelle data, except where Vsource indicates other default
Vel_err Velocity formal error default
Vsource Source of Velocity. C09 (Caldwell 2009, AJ 137, 94) C11 (Caaldwell 2011 AJ 141, 61), C16 (Caldwell 2016 ApJ 824, 42), S11 (Strader 2011, ApJ 142, 8), HX (Huxor 2014), B (Barmby 2000), CL (Colucci 2017), BS (unpublished Binospec), RBC (Galetti et al. 2007), lamost (Chen et al 2016, AJ 152, 45) default
Vel_P02 Velocity from Perret (2002 AJ, 123, 2490) full
Verr_P02 Velocity error on Vel_P02 full
Vel_K07 Velocity from Kim (2007, AJ, 134, 706) full
Verr_K07 Velocity error on Vel_K07 full
Vel_G07 Velocity from Galletti (2007, AAP, 471, 127) full
Verr_G07 Velocity error on Vel_G07 full
E(B-V) Estimated reddening default
Esource source of reddening H=C09, BA=Barmby (2000 AJ, 119. 727) default
Type Object type: old_cluster, disk_cluster, cluster (type unknown), star, probstar, PN, HII, syst (Symbiotic Star), back, na, unknown default
S/N_B Spectral S/N at 4000A full
S/N_r Spectral S/N at 6500A full
Source cat Source of object full
Comments Comments about the object or the spectrum default
HST Is there an HST image of this object? default
Vmag_source source of V magnitude: L = C09, B=Barmby 2000, G=Galleti 2007, H=Huxor (2014, MNRAS 442, 2165) default
Age Age in Gyr, from C09, etc default
Age_J16 Age (Gyr) from Johnson 2016 (ApJ 827, 33) default
Z [Fe/H] estimate using Fe lines (C11) default
Z_err Error on [Fe/H] default
Zstrong [Fe/H] using strong lines (unpublished) full
Zstrong_err Error on strong line [Fe/H] full
Zsource source of [Fe/H] default
Sigma Velocity dispersion from S11 default
Sigma_err Velocity dispersion error from S11 default
Vel_S11 Velocity from S11 full
Verr_S11 Velocity error on Vel_S11 full
Log(M) Log of mass, using V and M/L=2 default
Log(M)_J16 Log of mass from J16 default
Luminosity_V Luminosity in V band (C09) default
M/L Mass to Light, derived as listed in M/L source full
M/L source C09, S=Strader et al, and K use K band, V uses V band full
Vmag V total magnitude from C09 default
Vmag_err error on Vmag default
MAG275 HST photometry from J15 full
SIG275 HST photometry from J15 full
MAG336 HST photometry from J15 full
SIG336 HST photometry from J15 full
MAG475 HST photometry from J15 full
SIG475 HST photometry from J15 full
MAG814 HST photometry from J15 full
SIG814 HST photometry from J15 full
MAG110 HST photometry from J15 full
SIG110 HST photometry from J15 full
MAG160 HST photometry from J15 full
SIG160 HST photometry from J15 full
r_g aperture size from P2010 (Peacock et al MNRAS 402, 803) full
g photometry from P2010 full
u-g photometry from P2010 full
g-r photometry from P2010 full
r-i photometry from P2010 full
i-z photometry from P2010 full
g_err photometry from P2010 full
u-g err photometry from P2010 full
g-r err photometry from P2010 full
r-i err photometry from P2010 full
i-z err photometry from P2010 full
r_K aperture size in K, P2010 full
K photometry from P2010 full
K_err photometry from P2010 full
c King model concentration P2010 default
r_c King model core radius P2010 default
r_h King model half light radius P2010 default
r_t King model tidal radius P2010 default
Log(rho0) King model central density P2010 default
Datalink html link for spectra, images default
Cfalink html link for spectra, images from CfA server full
Publications

Colloaborators include: Nelson Caldwell, Heather Morrison, Paul Harding, Jim Rose, Ricardo Schiavon, Joanna Mikolajewska, Michael M. Shara, Jay Strader, Aaron Romanowsky, Nathan Sanders, Souradeep Bhattacharya, Magda Arnaboldi.

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